[TASK] Move install.html to EXT: install

Moves typo3/templates/install.html to EXT: install as Notice.html

Change-Id: If2f663ba88bf952a8c15c3478dd277d796a283f7
Fixes: #47896
Releases: 6.2
Reviewed-on: https://review.typo3.org/20475
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring